Daikin AVV - Cooling - Chilled Water Modulating; Valve Piping

www.DaikinApplied.com 35 IM 817-7
Cooling – Chilled Water Modulating
Valve Piping
2-way Modulating, Normally Closed,
Chilled Water Valve Piping (typical)
The 2-way Modulating chilled water valve is furnished
normally closed to the coil. When the valve is de-energized
(off) there is no ow through the coil. Energizing the valve
allows ow through the coil in a modulating fashion.
CAUTION
Refer to the arrow on the modulating valve body to determine the
direction of ow. If the valve is mounted improperly, the unit will
not operate properly and damage to the valve may result.
Figure 90: 2-Way Modulating Valve Control, Normally
Closed, Chilled Water Piping
Return
Return
Balancing and Shutoff Valve
Shutoff Valve
Supply
Supply
2-way Modu-
lating
Valve
Unit Coil
Unions
Figure 91: 2-Way Modulating, Normally Closed Chilled
Water Valve Piping
3-Way Modulating, Normally Closed,
Chilled Water Valve Piping (typical)
The 3-way Modulating chilled water valve is furnished
normally closed to the coil. When the valve is de-
energized (off) the ow bypasses the coil. Energizing the
valve allows ow through the coil in a modulating fashion.
Figure 92: 3-Way Modulating Valve Control, Normally
Closed, Chilled Water Piping
Return
Shutoff Valve
Supply
Supply
3-way
Modulating
Valve
Union
Balancing Valve
N.C.
N.O.
Return
Unit Coil
Union
Common
Balancing and Shutoff Valve